First Trinal Flashcards
The amount of charge required to pass a current of one ampere past a point in one second.
One coulomb
The rate of energy transfer for an appliance.
Power
Types of Energy:
Electrical Energy, Heat Energy, Atomic Energy, Mechanical Energy
Flow of electron, measured by ammeter.
Current ( Polarity in DC )
Ability to do work.
Potential
The difference in electric potential between two points.
Voltage ( Polarity in DC )
Provides the electrical pressure or force that enables the current or electrons to flow.
Voltage
Restrict / Opposes flow of current. Produce heat when current flows through it.
Resistance ( Units is ohms )
Increasing _______ will reduce flow of current.
Resistance
Coil of wire. Opposes change in current.
Inductor ( Unit is henry )
A component that stores energy. Gets charged when voltage is applied.
Capacitor
Materials that have low resistance to current flow. Used in electrical circuits to connect components to one another.
Conductors ( Copper, Aluminum, Gold )
Materials that have a high resistance to current flow. Materials that do not permit heat and electricity to pass through it.
Insulators ( Glass, rubber and dry air )
Relation between three quantities learnt.
Ohm’s law
0.746 kilowatts
1 hp ( Horsepower )
One path for current flow.
Series circuit
Some voltage loss takes place across each load and is called _____.
Voltage drop
Occur when current does not go through its inetended path.
Short circuits
Measures multiple types electrical characteristics with a single device.
Multitester
Includes any type of heating element. Best examples are Incandescent lights, toasters, ovens, space heaters, and coffee makers
Resistive load
Provide power to electric motors. Examples are moving parts Fans, vacuum cleaners, dishwashers, washing machines, compressors in refrigerators and air conditioners, and other household items and gadgets.
Inductive load
Has both current and voltage waves, and current peaks before the voltage.
Capacitive load
Supply a lot of electricity, used in many electrical appliances.
Power stations
Supply a little electricity, portable, safe.
Electric cells ( Batteries )
Instrument used to measure voltage.
Voltmeter
Voltmeter must be connected _____ to the circuit.
Across
The flow of electricity is called _____.
Electric current
An instrument used for measuring electric current.
Ammeter
Ammeter must be connected in _____ in the circuit.
Series
Electric circuits are made up of _____?
Electrical components
Incomplete circuits are called ____.
Open circuits
Used to open or close a circuit.
Switch
A single loop is formed.
Series circuit
A measure of how much energy the electrons receive.
Voltage
An electrical component that is specially made to have a certain resistance is called _____?
Resistor
This have only on resistance value.
Fixed resistors
This can be adjusted to change the resistance.
Variable resistors
The chemical change that occurs when an electric current passes through solutions or molten compounds.
Electrolysis
A magnet that is made by using electricity.
Electromagnet
_____ is a Joule per Columb (J/C).
One Volt
One Amp of current is _____
One Coulomb per second
Produced by solar cells and chemical cells ( Batteries ). Current only flows in one direction.
Direct Current
Current flows back and forth ( alternates ), generators produce them.
Alternating current
How many is the 120 volts circuits in amp?
15 - 20 amp circuits
How many is 249 volt circuits in amps?
30, 40, or 50 amps
Objects that allow electric current to flow are called _____.
Conductors
Begins with main service wires that enter your home from an overhead utility line or underground feeder wires.
Branch circuits
Circuits that serve general lighting need in rooms.
Lighting circuits
These are circuits that serve only general purpose plug in outlets.
Outlet circuits
Depending on how the home has been wired, sometimes the circuit layout has all lights and outlets in a room served by individual circuits.
Room circuits
Small drawings or pictograms used to represent various electrical devices.
Electrical symbols
An electrical design goes through several important stages of development.
Design process
It requires seperate or dedicated electrical circuitry.
Specialized electrical requirements
The part of the design process that generally requires the greatest amount of time to develop.
Lighting systems
The installed equipment that provides for the distribution of electrical wiring throughout the facility.
Distribution system
The main and largest equipment of distribution substation.
Distribution transformer
It is a drum containing transformer oil and mounted at the top of the transformer and connected to the main tank by a pipe.
Conservator
It prevents transformer oil from moisture contamination and it contain silica gel.
Breather
It is protective relay of transformer. This device signals the fault as soon as it occurs and cut the transformer out of the circuit l immediately.
Buchholz Relay
This causes an instantaneous vaporization of oil, leading to extremely rapid buildup of gaseous pressure.
Explosion Vent
It indicates level of transformer oil at the conservator of the transformer.
Oil level indicator
It provides passage to pout the transformer oil in the tank during purification or in case of shortage found in the tank.
Inlet valve
It provides passage to drain the oil during overhauling or as and when required oil sample for testing.
Outlet valve
These tubes provide better and effective cooling of transformer oil by increasing the surface area of tank to the atmosphere.
Cooling tubes
Used to regulate the output voltage manually according to line voltage.
Tap changer
An equipment which automatically cut of power supply of the system when any fault or short circuit occurs in the system.
Circuit breaker
It arrest and discharges over voltage to earth during lightning strokes.
Lightning arrester
Used to isolate equipment for maintenance and also for transfer of load from one bus to another.
Air break switch / Isolator
To insulate live conductor or equipment at different voltage with reference to the ground structures as well as provide mechanical support.
Insulator
A conductor used to connect two or more equipment located side by side when the currents are very high.
Busbar arrangement
A series parallel combination of capacitors required to improve power factor of the system.
Capacitor bank
Has a very low resistance and connects the electrical equipment to the general mass of the earth.
Earthing
Provided at outdoor substation yard for restricting entry of unauthorized person and livestock.
Fencing arrangement
The housed in the control room.
Distribution panelboard
A top view, birds eye view of a property that is drawn to scale.
Site plan
Disposition of doors and windows in the external walls, east side.
Aspect
Outside view seen from inside of the room.
Prospect
Exposure of the interior space / room to the visitors vision
Privacy
Getting maximum benefit from minimum dimensions or space of room.
Roominess
Passage, corridors, verandahs are what type of circulation?
Horizontal circulation
Stairs, lifts, escalators are example of what kind of circulation?
Vertical circulation
To facilitate accommodation of changes in the plan of the building in future if necessary.
Flexibility
The aeshtetic view of the building or the beauty of the building.
Elegence
Plans today are created digitally using _____.
Computer aided design
Which activity did we discover what objects are conductors and what objects are nonconductors?
Solid conductors
